Graphene/polyimide-based nitrogen-doped carbon aerogel and preparation and application thereof

A polyimide-based nitrogen and carbon aerogel technology, which is applied in the preparation/purification of carbon, hybrid capacitor electrodes, etc., can solve the problems of destroying the macrostructure of carbon aerogels and using a large amount of KOH, and achieve the synthesis process. Simple, high rate, high capacitance performance effect

Inactive Publication Date: 2018-12-11
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the current KOH chemical activation method can improve the pore structure of polymer-based carbon aerogels and greatly increase its specific surface area, the shortcomings and limitations of this method are reflected in the following points: (1) polymer-based carbon aerogels require It is first prepared by high-temperature carbonization, and then pulverized and mixed with KOH for grinding and mixing, which destroys the macroscopic structure of carbon aerogels; (2) KOH is used in a large amount, generally 3-6 times the mass of polymer-based carbon aerogels

Method used

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  • Graphene/polyimide-based nitrogen-doped carbon aerogel and preparation and application thereof
  • Graphene/polyimide-based nitrogen-doped carbon aerogel and preparation and application thereof
  • Graphene/polyimide-based nitrogen-doped carbon aerogel and preparation and application thereof

Examples

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Effect test

Embodiment 1

[0035] (1) Using N,N-dimethylacetamide as a solvent, add 4,4'-diaminodiphenyl ether and pyromellitic anhydride in an ice-water bath for condensation polymerization in an equimolar ratio to prepare a solid content 15% polyamic acid. The specific process is as follows: Dissolve 8.0096g of 4,4'-diaminodiphenyl ether in 95.57g of N,N-dimethylacetamide, add 8.86g of pyromellitic anhydride, and react in an ice-water bath for 5h. Then, 4.0476 g of triethylamine was added, and the reaction was continued for 3 hours to prepare a water-soluble polyamic acid solution with a solid content of 15%. The prepared water-soluble polyamic acid is precipitated with deionized water, and then washed and freeze-dried to obtain the water-soluble polyamic acid fiber for use.

[0036] (2) Take 20 mL of the prepared 2 mg / mL graphene oxide aqueous solution, add 1 g of triethylamine, and sonicate for 0.5 h. Add 2g of water-soluble polyamic acid fiber to the graphene oxide aqueous solution containing tri...

Embodiment 2

[0042] In Example 1, the mass ratio of KOH-activated carbon airgel to urea was changed to 1:3. The rest of the operations were the same as in Implementation 1, and finally a graphene / polyimide-based nitrogen-doped carbon aerogel was prepared, and this sample was designated as NC2-13-1000.

Embodiment 3

[0044] In Example 1, the mass ratio of KOH-activated carbon airgel to urea was changed to 1:5. The rest of the operations were the same as in Implementation 1, and finally a graphene / polyimide-based nitrogen-doped carbon airgel was prepared, and this sample was designated as NC2-15-1000.

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Abstract

The invention relates to a graphene / polyimide-based nitrogen-doped carbon aerogel and preparation and application thereof. The aerogel is prepared by performing crosslinking on polyamide acid by usingoxidized graphene, adding potassium hydroxide to obtain a hydrogel, preparing aerogel by the processes of aging and freeze-drying, then performing carbonization activation on the aerogel, and then mixing with urea, and performing secondary carbonization. The preparation method comprises the following steps: preparation of oxidized graphene / polyamic acid hydrogel, preparation of potassium hydroxide / oxidized graphene / polyamic acid aerogel, preparation of activated carbon aerogel, and preparation of graphene / polyimide-based nitrogen-doped carbon aerogel. The preparation method is simple in synthesis process and simple and convenient in operation, and thus is a green chemical preparation method. The obtained nitrogen-doped carbon aerogel has relatively good rate capability and relatively highcapacitive performance.

Description

technical field [0001] The invention belongs to the field of nitrogen-doped carbon materials and their preparation and application, in particular to a graphene / polyimide-based nitrogen-doped carbon aerogel with high rate performance and its preparation method and application. Background technique [0002] Aerogel is a new type of lightweight solid material composed of a network skeleton composed of colloidal particles or polymer molecules aggregated with each other and a gaseous dispersion medium filled in the pores. Airgel is the lightest material known in the world. Due to its unique three-dimensional porous network structure and excellent performance, airgel has broad application prospects in the fields of energy, environmental protection, construction, microelectronics, and aerospace. [0003] Supercapacitor is a new type of energy storage device between traditional physical capacitors and batteries. It has the advantages of fast charging and discharging, environmental ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05C08J9/28C08L79/08H01G11/44
CPCC08J9/28C08J2201/0484C08J2379/08C01B32/05H01G11/44Y02E60/13
Inventor 樊玮王栋刘天西
Owner DONGHUA UNIV
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